Process and device for the manufacture of seat air cushions



P. HERZ Sept. 24, 1929.

PROCESS AND DEVICE FOR THE MANUFACTURE OF SEAT AIR CUSHIONS Filed April10, 1928 Itctt Patented Sept. 24, 1929 UNITED STATES PATENT OFFICEPHILIP! HERZ, OF WINDSHEIM, GERMANY PROCESS AND DEVICE FOR THEMANUFACTURE OF SEAT AIR CUSHIONS Application filed April 10,

My present invention relates to a process and a device for themanufacture of seatair cushions for sick-beds. In making air cushions itis usual to employ two rubber plates cut in a suitable shape anddisposed above each other, which are connected on their edges in formingtwo longitudinal parallel seams. Such cushions have the disadvantagethat they become untight at the seams after a short use requiring thuslengthy and troublesome repairs. Furthermore the invalid is unfavourablyinfluenced through the pressure exerted by the hard edges of the seams.

According to my invention the above mentioned disadvantages areobviated, as the improved air cushion is made without any longitudinalseam and consists of a seamless circular tube.

The accompanying drawing shows by way of example the object of mypresent invention in which Fig. 1 is a plan view of an air cushion, Fig.2 is a cross section of Fig. l partly in longitudinal section.

Fig. 3 is a plan view partly in section of the mandrel, for making theair cushion.

Fig. 4 is a sectional view of the connection for the parts of themandrel.

The air cushion consists of a circular tube A made without anylongitudinal seam. At

the joint both ends overlap each other and are fixed together in thewell known manner. By this connection only a short outer seam,positioned in a radial plane to the circular cushions is formed, whichis of no disadvantageous influence whatsoever as the seam is formed in aposition which the invalid can avoid by placing the cushion in asuitable manner. The two overlapping ends of the 4 circular tube canmoreover easily be tightened, all the more as, by pumping up thecushion, the inner tube end is pressed against the outer one, owing tothe existing inner prr sure.

What I claim is:

PHILIPP HERZ.

